What’s this white pest on my grapes?

Bag my grapes, and open to find half the bunches afflicted.

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It’s probably just a mold growing on overipe/split fruit.

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Hard to tell from the pics, but it could be mealybugs. They like to crawl into the bunches and multiply. A small population isn’t a huge deal, but they do transmit grape viruses and the honeydew they produce can grow mold and cover your fruit.